Beginner's questions freq variation

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Beginner's questions freq variation

My Ultimate3 WSPR beacon is working - well it is actually just on a breadboard as I messed up the PCB and await a new one. I am using a G5RV antenna oriented NS. The frequency is calibrated from GPS and I notice the spots on WSPRnet the frequency varies between 14.097126 and 14.097145 for different receiving stations. Is that going to be largely the variation in the calibration of the clocks on the receiving stations or are there other factors at work?


Bill M0WLH